【回答】エラー対処について
問題
「 $ git push heroku 」を実行した際、以下のエラーが発生した。
エラー原因を調べる時、ヒントとなる情報がある部分はどこでしょうか。
前提
エラーログ
Enumerating objects: 46, done. Counting objects: 100% (35/35), done. Delta compression using up to 4 threads Compressing objects: 100% (16/16), done. Writing objects: 100% (16/16), 3.51 KiB | 3.51 MiB/s, done. Total 16 (delta 9), reused 0 (delta 0) remote: Compressing source files... done. remote: Building source: remote: remote: -----> Ruby app detected remote: -----> Compiling Ruby/Rails remote: remote: ###### WARNING: remote: remote: This buildpack was created as a stop-gap measure to allow running applications with Bundler 2 on Heroku. remote: Heroku now supports Bundler 2 directly: https://devcenter.heroku.com/changelog-items/1563 remote: remote: Please discontinue use of this buildpack and instead directly use the `heroku/ruby` buildpack. remote: remote: To remove this buildpack use the `heroku buildpacks` command to list your existing buildpacks. remote: remote: If you only have one buildpack listed you can run: remote: remote: ``` remote: heroku buildpacks:set heroku/ruby remote: ``` remote: remote: If you have multiple buildpacks, you'll need to add the buildpack to the correct location using remote: `heroku buildpacks:add heroku/ruby -i <correct index>` and then remove this buildpack via: remote: remote: ``` remote: heroku buildpacks:remove https://github.com/bundler/heroku-buildpack-bundler2 remote: ``` remote: remote: Your app was upgraded to bundler 2.0.1. remote: Previously you had a successful deploy with bundler 2.0.2. remote: remote: If you see problems related to the bundler version please refer to: remote: https://devcenter.heroku.com/articles/bundler-version remote: remote: -----> Using Ruby version: ruby-2.5.1 remote: -----> Installing dependencies using bundler 2.0.1 remote: Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment remote: The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`. remote: Using rake 13.0.1 remote: Using concurrent-ruby 1.1.5 remote: Using i18n 1.7.0 remote: Using minitest 5.13.0 remote: Using thread_safe 0.3.6 remote: Using tzinfo 1.2.5 remote: Using activesupport 5.2.3 remote: Using builder 3.2.3 remote: Using erubi 1.9.0 remote: Using mini_portile2 2.4.0 remote: Using nokogiri 1.10.5 remote: Using rails-dom-testing 2.0.3 remote: Using crass 1.0.5 remote: Using loofah 2.3.1 remote: Using rails-html-sanitizer 1.3.0 remote: Using actionview 5.2.3 remote: Using rack 2.0.7 remote: Using rack-test 1.1.0 remote: Using actionpack 5.2.3 remote: Using nio4r 2.5.2 remote: Using websocket-extensions 0.1.4 remote: Using websocket-driver 0.7.1 remote: Using actioncable 5.2.3 remote: Using globalid 0.4.2 remote: Using activejob 5.2.3 remote: Using mini_mime 1.0.2 remote: Using mail 2.7.1 remote: Using actionmailer 5.2.3 remote: Using activemodel 5.2.3 remote: Using arel 9.0.0 remote: Using activerecord 5.2.3 remote: Using mimemagic 0.3.3 remote: Using marcel 0.3.3 remote: Using activestorage 5.2.3 remote: Using execjs 2.7.0 remote: Using autoprefixer-rails 9.7.1 remote: Using bcrypt 3.1.13 remote: Using msgpack 1.3.1 remote: Using bootsnap 1.4.5 remote: Using ffi 1.11.2 remote: Using sassc 2.2.1 remote: Using bootstrap-sass 3.4.1 remote: Using will_paginate 3.2.1 remote: Using bootstrap-will_paginate 1.0.0 remote: Using bundler 2.0.2 remote: Using coffee-script-source 1.12.2 remote: Using coffee-script 2.4.1 remote: Using method_source 0.9.2 remote: Using thor 0.20.3 remote: Using railties 5.2.3 remote: Using coffee-rails 4.2.2 remote: Using faker 2.2.0 remote: Using gravtastic 3.2.6 remote: Using jbuilder 2.9.1 remote: Using jquery-rails 4.3.5 remote: Using pg 0.20.0 remote: Using puma 3.12.1 remote: Using sprockets 3.7.2 remote: Using sprockets-rails 3.2.1 remote: Using rails 5.2.3 remote: Using rb-fsevent 0.10.3 remote: Using rb-inotify 0.10.0 remote: Using sass-listen 4.0.0 remote: Using sass 3.7.4 remote: Using tilt 2.0.10 remote: Using sass-rails 5.1.0 remote: Using turbolinks-source 5.2.0 remote: Using turbolinks 5.2.1 remote: Using uglifier 4.2.0 remote: Bundle complete! 31 Gemfile dependencies, 69 gems now installed. remote: Gems in the groups development and test were not installed. remote: Bundled gems are installed into `./vendor/bundle` remote: Removing bundler (2.0.1) remote: Bundle completed (0.44s) remote: Cleaning up the bundler cache. remote: -----> Installing node-v8.10.0-linux-x64 remote: -----> Detecting rake tasks remote: -----> Preparing app for Rails asset pipeline remote: Running: rake assets:precompile remote: rake aborted! remote: NameError: undefined local variable or method `config_action_mailer' for #<SampleApp::Application:0x0000563ad4eeae70> remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/config/environments/production.rb:98:in `block in <top (required)>' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/railtie.rb:216:in `instance_eval' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/railtie.rb:216:in `configure' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/config/environments/production.rb:1:in `<top (required)>' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/engine.rb:602:in `block (2 levels) in <class:Engine>' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/engine.rb:601:in `each' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/engine.rb:601:in `block in <class:Engine>' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/initializable.rb:32:in `instance_exec' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/initializable.rb:32:in `run' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/initializable.rb:61:in `block in run_initializers' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/initializable.rb:50:in `each' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/initializable.rb:50:in `tsort_each_child' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/initializable.rb:60:in `run_initializers' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/application.rb:361:in `initialize!' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/config/environment.rb:5:in `<top (required)>' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/application.rb:337:in `require_environment!' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/application.rb:520:in `block in run_tasks_blocks' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:62:in `block (2 levels) in define' remote: /tmp/build_86c01264d697b18eed4ad26b2672a6eb/vendor/bundle/ruby/2.5.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>' remote: Tasks: TOP => environment remote: (See full trace by running task with --trace) remote: remote: ! remote: ! Precompiling assets failed. remote: ! remote: ! Push rejected, failed to compile Ruby app. remote: remote: ! Push failed remote: Verifying deploy... remote: remote: ! Push rejected to hidden-thicket-92473. remote: To https://git.heroku.com/hidden-thicket-92473.git ! [remote rejected] master -> master (pre-receive hook declined) error: failed to push some refs to 'https://git.heroku.com/hidden-thicket-92473.git'
回答
以下の部分。
remote: NameError: undefined local variable or method `config_action_mailer' for #<SampleApp::Application:0x0000563ad4eeae70>
「 config.action_mailer 」とすべきところを「config_action_mailer 」としてしまったことで「 undefined local variable or method 」が発生していました。
もうちょっと解説
当初以下の部分にエラー原因があると思い込み、ググって調べていました。
実際に様々な対処方法がヒットします。
当初エラー原因と思っていた箇所
remote: ! remote: ! Precompiling assets failed. remote: ! remote: ! Push rejected, failed to compile Ruby app. remote: remote: ! Push failed remote: Verifying deploy... remote: remote: ! Push rejected to hidden-thicket-92473. remote: To https://git.heroku.com/hidden-thicket-92473.git ! [remote rejected] master -> master (pre-receive hook declined) error: failed to push some refs to 'https://git.heroku.com/hidden-thicket-92473.git'
権限周りのエラーでこのようなエラーが出ることが多いらしいのですが、今回は違いました。
「 error 」「 rejected 」「 failed 」というキーワードが集中しているエラーログの最後の部分ばかり注目してしまったわけですが、思い込みは良くないですね。
教訓
エラー原因を調べる時はエラーログ全体を眺めるようにする。
